Advice on periodically moving images to external libraries

So I like to store my images in dated/named folders on my NAS "\yyyy_mm_dd desciption of day" etc, 30 years worth, but I also like the auto cell phone/mobile backup of images to immich. Of course this imports them into the immich database. I read somewhere that I shouldn't simply delete the images from the "\library\admin\2025" folder.
So what is the best way I can for example every two months move the immich stored images/videos to my NAS and then use external folders instead? Can I automate this process? I did check the wiki but couldn't see any advice.
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